The Difference Between The 5.9 Cummins Turbo And The 6.7 Cummins

The 6.7 Cummins diesel replaced the 5.9 Cummins diesel when the 6.7 was first put in the 2007 line of Dodge Ram diesel trucks. The expectations for the 6.7 were high because the 5.9 engine was well-known for its durable performance as well as the ability to withstand high mileage.

The 6.7 Cummins first came on the scene, it was off to a good start because The 5.9 Cummins had a reputation for solid performance as well as a wide array of aftermarket support with parts and service. But there are some notable differences between these two. The following are some of them.

First of all, the 5.9 cummins turbo and the 6.7 cummins differ when it comes to emissions control. The 6.7 Cummins comes equipped with a full range of emissions control parts that are not available on the 5.9 Cummins. These parts include an exhaust gas recirculation system, a diesel oxidation catalyst, a NOx absorption catalyst, a diesel particulate filter and beginning in 2013, a selective catalytic reduction. After that, the SCR became standard in Cummins 6.7L engines.

For the modern diesel engines such as the 6.7, emissions control systems are necessary due to strict requirements from the EPA. Unfortunately, they do interfere somewhat with performance. Without exhaust gas recirculation, the engine produces a hotter combustion temperature that allows it to burn fuel more completely. While this results in less particulate matter, it leads to more production of Nitrogen Oxide. The problem with producing more Nitrogen Oxide is that it results in excessive carbon buildup and that degrades engine oil as well as the coolant. Unlike the 6.7, the 5.9 did not have an exhaust gas recirculation system, something that likely helped its reputation for durability even with very high mileage on the engine.

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